Stair chair



FIG. 1 is a front side perspective view of a stair chair design unfolded and tracks deployed;

FIG. 2 is a front side perspective view of a stair chair design unfolded and tracks retracted;

FIG. 3 is a close-up front side perspective view thereof;

FIG. 4 is a back side perspective view of a stair chair design unfolded and tracks deployed;

FIG. 5 is a close-up back side perspective view thereof;

FIG. 6 is a back side perspective view of a stair chair design unfolded and tracks retracted;

FIG. 7 is a top front view of a stair chair design unfolded;

FIG. 8 is a top back view of a stair chair design unfolded and tracks deployed;

FIG. 9 is a back view thereof;

FIG. 10 is a back view of a stair chair design unfolded and tracks retracted;

FIG. 11 is a side view thereof;

FIG. 12 is a side view of a stair chair design unfolded and tracks deployed;

FIG. 13 is a front view thereof;

FIG. 14 is a bottom view of a stair chair design unfolded; and,

FIG. 15 is a bottom view of a stair chair design completely folded. 

The ornamental design for a stair chair, as shown and described. 